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Wed, 26 Aug 2020 16:52:40 +0200 (CEST) From: Gerd Hoffmann To: qemu-devel@nongnu.org Subject: [PULL 14/18] scripts: Add u2f-setup-gen script Date: Wed, 26 Aug 2020 16:52:35 +0200 Message-Id: <20200826145239.6077-15-kraxel@redhat.com> In-Reply-To: <20200826145239.6077-1-kraxel@redhat.com> References: <20200826145239.6077-1-kraxel@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kraxel@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/25 23:30:47 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.959, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , =?utf-8?q?C?= =?utf-8?q?=C3=A9sar_Belley?= , Gerd Hoffmann , Cleber Rosa , Paolo Bonzini , Eduardo Habkost Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: César Belley This patch adds the script used to generate setup directories, needed for the device u2f-emulated configuration in directory mode: python u2f-setup-gen.py $DIR qemu -usb -device u2f-emulated,dir=$DIR Signed-off-by: César Belley Message-id: 20200826114209.28821-11-cesar.belley@lse.epita.fr Signed-off-by: Gerd Hoffmann --- scripts/u2f-setup-gen.py | 170 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 170 insertions(+) create mode 100755 scripts/u2f-setup-gen.py diff --git a/scripts/u2f-setup-gen.py b/scripts/u2f-setup-gen.py new file mode 100755 index 000000000000..2122598fed8e --- /dev/null +++ b/scripts/u2f-setup-gen.py @@ -0,0 +1,170 @@ +#!/usr/bin/env python3 +# +# Libu2f-emu setup directory generator for USB U2F key emulation. +# +# Copyright (c) 2020 César Belley +# Written by César Belley +# +# This work is licensed under the terms of the GNU GPL, version 2 +# or, at your option, any later version. See the COPYING file in +# the top-level directory. + +import sys +import os +from random import randint +from typing import Tuple + +from cryptography.hazmat.backends import default_backend +from cryptography.hazmat.primitives.asymmetric import ec +from cryptography.hazmat.primitives.serialization import Encoding, \ + NoEncryption, PrivateFormat, PublicFormat +from OpenSSL import crypto + + +def write_setup_dir(dirpath: str, privkey_pem: bytes, cert_pem: bytes, + entropy: bytes, counter: int) -> None: + """ + Write the setup directory. + + Args: + dirpath: The directory path. + key_pem: The private key PEM. + cert_pem: The certificate PEM. + entropy: The 48 bytes of entropy. + counter: The counter value. + """ + # Directory + os.mkdir(dirpath) + + # Private key + with open(f'{dirpath}/private-key.pem', 'bw') as f: + f.write(privkey_pem) + + # Certificate + with open(f'{dirpath}/certificate.pem', 'bw') as f: + f.write(cert_pem) + + # Entropy + with open(f'{dirpath}/entropy', 'wb') as f: + f.write(entropy) + + # Counter + with open(f'{dirpath}/counter', 'w') as f: + f.write(f'{str(counter)}\n') + + +def generate_ec_key_pair() -> Tuple[str, str]: + """ + Generate an ec key pair. + + Returns: + The private and public key PEM. + """ + # Key generation + privkey = ec.generate_private_key(ec.SECP256R1, default_backend()) + pubkey = privkey.public_key() + + # PEM serialization + privkey_pem = privkey.private_bytes(encoding=Encoding.PEM, + format=PrivateFormat.TraditionalOpenSSL, + encryption_algorithm=NoEncryption()) + pubkey_pem = pubkey.public_bytes(encoding=Encoding.PEM, + format=PublicFormat.SubjectPublicKeyInfo) + return privkey_pem, pubkey_pem + + +def generate_certificate(privkey_pem: str, pubkey_pem: str) -> str: + """ + Generate a x509 certificate from a key pair. + + Args: + privkey_pem: The private key PEM. + pubkey_pem: The public key PEM. + + Returns: + The certificate PEM. + """ + # Convert key pair + privkey = crypto.load_privatekey(crypto.FILETYPE_PEM, privkey_pem) + pubkey = crypto.load_publickey(crypto.FILETYPE_PEM, pubkey_pem) + + # New x509v3 certificate + cert = crypto.X509() + cert.set_version(0x2) + + # Serial number + cert.set_serial_number(randint(1, 2 ** 64)) + + # Before / After + cert.gmtime_adj_notBefore(0) + cert.gmtime_adj_notAfter(4 * (365 * 24 * 60 * 60)) + + # Public key + cert.set_pubkey(pubkey) + + # Subject name and issueer + cert.get_subject().CN = "U2F emulated" + cert.set_issuer(cert.get_subject()) + + # Extensions + cert.add_extensions([ + crypto.X509Extension(b"subjectKeyIdentifier", + False, b"hash", subject=cert), + ]) + cert.add_extensions([ + crypto.X509Extension(b"authorityKeyIdentifier", + False, b"keyid:always", issuer=cert), + ]) + cert.add_extensions([ + crypto.X509Extension(b"basicConstraints", True, b"CA:TRUE") + ]) + + # Signature + cert.sign(privkey, 'sha256') + + return crypto.dump_certificate(crypto.FILETYPE_PEM, cert) + + +def generate_setup_dir(dirpath: str) -> None: + """ + Generates the setup directory. + + Args: + dirpath: The directory path. + """ + # Key pair + privkey_pem, pubkey_pem = generate_ec_key_pair() + + # Certificate + certificate_pem = generate_certificate(privkey_pem, pubkey_pem) + + # Entropy + entropy = os.urandom(48) + + # Counter + counter = 0 + + # Write + write_setup_dir(dirpath, privkey_pem, certificate_pem, entropy, counter) + + +def main() -> None: + """ + Main function + """ + # Dir path + if len(sys.argv) != 2: + sys.stderr.write(f'Usage: {sys.argv[0]} \n') + exit(2) + dirpath = sys.argv[1] + + # Dir non existence + if os.path.exists(dirpath): + sys.stderr.write(f'Directory: {dirpath} already exists.\n') + exit(1) + + generate_setup_dir(dirpath) + + +if __name__ == '__main__': + main()